Alexander c



tait@ tatreatrat @frn Laim Patent No. 75,080, ma arma e, 1868.

IMPROVBD SOCKET FOR GASTERS.

atge .straalt referat tu in tipa Eaters zrtait mit mating pitt nt the anus.'

Beit known that I, XL1-)SANDER C. TWINING, of the city and county of New Haven, and State-of. Connectieut, have invented a new and useful Attachment of Sockets for Casters andthe like; and I do hereby declare that the following is a full, clear, -and exact description of the same, reference being had to the annexed draw-v ing, of which- Figure I, and the section beneath and in connection with it, show the attachment for a bed, as, for g instance, the hed or plate of a caster; and

Figure II, and itscorrespcnding section, show the same for a socket.

In both figures b b b l) is the bed, socket, band, or the like. In` Fig. I this has a number, say eight, of oblique parallel ridges, 'cast or made upon its exterior, and n Fig. II the like are shown on the interior. Some ot' these ridges are marked by rr r a', both on the main figures and the sections. The ridges fr' r'r, taper from their bases to a blunt edge, as seen most obviously in both the sectionsf This edge is not'necessarily a spiral, although such, in a slight degree, to the eye, when viewed in the drawing. It maybe made spiral,'it` desired, but, otherwise, it may lie all in one plane, like the-curved edge of a scimiter, as willl bc immediately apparent by looking along such edges di' the actual casting. They must not, like screw-threads, run round and round, as the use and purpose, explained farther on will evidently show, but theyl should lie along, with only -such'moderate'obliquity that the force -to set the hed (as Fig. I) Vinto thetimber, or to set the timber into the socket, (as in the shape of Fig. IL) cannot be tangential or screwing, but must vbe applied lengthwise, as in driving a. bolt or nail. The rotation'eonsequent upon driving in the piece is an incident' only, without importance otherwise to the improvement or eliee't. The collar c c, Fig. I, limits the depth of penetration, and also supplies a base ot`-support to the superineumbent weight.` Much more do the ridges,`,by their oblique` set,-

supply n. like base. To this the hold by friction also contributes, and it will require but ordinary attention in the mechanic to secure, yet farther, that the bed shall reach to and abut upon the end 'of the base.

AFor exemplieation of the`ahove, let Fig. I represent' the bed or socket for the pintle-ot` a easter. It is to be driven into a base suited in diameter to b Zw Z1 b. I am aware that screw-bolts have been proposed, for other' uses, which are adapted to be driven. These, however, would split the small woodcu'stocks,'the legs of a table, for example, int-o which mine can be driven. Again, the former can be taken out by unscrewing, whereas it iS a distinct and important property that mine, even it' feebly attached, cannot be screwed out, as by the action of a caster or otherwise. In fact, also, my article shows the two striking peculiarities thatit does'not, in the wood, hold lengthwise ofits own stock or shank, as a screw, but it holds in a plane across the length, and tangentially around the circumference, and so against splitting. Secondly, itcan be taken out, as well las set in, by afforce lengthwise applied, while the friction and situation of its ridges prevent any screwing. .One point ol' the construction by which this is realized, besidesth'e acute triangular section of the ridges, is such a form and position as make their edges lie completely, or nearly, in planes acutely and equally inclined to the axis of the socket or steek. .This formation encloses ribs of wood between the ridges, and thus holds the parts together.

For beds 'driven intenl very small stock, it will be an additional preventive ot'splitting to run valleys, u 11, at the base of theiridges rr, in which the compressed wood around the bore cdu partially spread. These depressions or valleys are most distinctly exhibited in the section through S S and the fsection I I in theeaccompanying drawing. It will also be cvident,.on a bare inspection of the scctious, that these valleys v v mightbe Sonumerous and set so closely aste form, of themselves, by the separating metal, substantially the rigid surface herein described.

Fig. ILexhibits the same things on the interior surface of a socket or ring, thus illustrating one variation,

or equivalent, of all the above. The ridges, however, are there seen not to 'traverse the entirc-cylindrie length, but to alternate in'one series and another of short ridges mutually overlapping. Ot such series as many may be made as shall be desired. This form of ridge-bed admits the attachment of a wooden handle by simply drlvng inthe latter. A pin, p, orpins, may be driven through the wood in'to an orifice in the metal. The same 1S obvious as applied to lany other than these two forms of the invention.

Olaz'm.

What I claim as my invention, and desire to secure by Letters Patent, is 1. The socket or stock, made with ridges edged, or nearly so, in planes acutely and equally inclined to the axis of the socket, as and for the purpose described.

2. The valleys, along the ridge bases, for an increased prevention of splitting, as herein described.

ALEXR'G. TWINING.

Witnesses:

J. W. COLLINS, Jr., JAMES OLMSTEAD. 

